<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body{
            background-color: #000;
        }
        .box{
            height: 200px;
            width: 200px;
            border: 1px solid red;
            background-image: radial-gradient(
                circle,
                yellow 5%,
                transparent 60%

            );
        }
    </style>
</head>
<body>
    <div class="box"></div>
</body>
</html>